---
title: "Character Iconicity vs. Arbitrariness — Ahmad; 2026"
description: "Many Arabic letters share one base shape (rasm) and differ only in their dots."
authors: ["Dorieh Alomari; Irfan Ahmad;", "Maged S. Al-shaibani"]
year: 2026
venue: "arXiv:2608.02935"
source: "https://arxiv.org/abs/2608.02935"
doi: "10.48550/arxiv.2608.02935"
arxiv: "2608.02935"
licence: "CC BY 4.0 (arXiv)"
licence_url: "http://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/alomari-2026-character-iconicity-vs-arbitrariness-arabic/"
---
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# Character Iconicity vs. Arbitrariness: An Arabic NLP Perspective

**Authors:** Dorieh Alomari; Irfan Ahmad;, [Maged S. Al-shaibani](https://md.research.elamur.ai/free/en/authors/maged-s-al-shaibani/) · **Year:** 2026 · **Venue:** arXiv:2608.02935 · **Licence:** [CC BY 4.0 (arXiv)](http://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://arxiv.org/abs/2608.02935) · [PDF](https://arxiv.org/pdf/2608.02935) · [DOI 10.48550/arxiv.2608.02935](https://doi.org/10.48550/arxiv.2608.02935) · [arXiv 2608.02935](https://arxiv.org/abs/2608.02935) · [OpenAlex](https://openalex.org/W7172494932)

**Citations:** 0 citations (openalex-snapshot · 2026-10-14)

## Summary
Many Arabic letters share one base shape (rasm) and differ only in their dots. Earlier work showed that undotted Arabic still works well for NLP. This paper asks why. Does it work because the historical rasm groupings carry real visual or orthographic structure, or because models adapt to any reduced alphabet that is applied consistently?

The authors keep the 19 undotted rasms as the output alphabet and the original group sizes, but assign letters to groups at random. They generated 2,000 such mappings under word-level and under character-level tokenization. From these they kept the four with the highest and lowest entropy. These mappings were compared with standard dotted and dotless text on:
- predicting text with a language model
- assigning categories to texts
- tagging tokens within a sequence
- translating between languages
- restoration of the original script

They also tested several tokenizers. The random mappings performed competitively and often shrank vocabulary, OOV rates, model size and training cost. The authors conclude that, computationally, Arabic letter form is largely arbitrary: models depend on stable distributional patterns, not on the iconicity of letter shapes. This matters for designing compact script encodings.

## Key points
- **Setup:** 28 Arabic letters are collapsed onto 19 rasms. The four selected random mappings are HCE/LCE (highest/lowest character-level entropy) and HWE/LWE (highest/lowest word-level entropy), each chosen from 2,000 candidates.
- **Tokenizers:** word, character, Farasa morphological, disjoint-letters, and SentencePiece BPE. Corpus statistics come from Wikipedia Arabic.
- **Models:** all task models are modest (non-pretrained) neural networks:
  - decoder language model
  - GRU/BiGRU classifiers for poem meter, sentiment and news topic
  - BiLSTM taggers for POS and NER
  - encoder-decoder Transformer for MT
  - BiLSTM for restoration
- **Vocabulary under Farasa:** about 1.13M for dotted, 891K for dotless, and 728K for LWE. Some mappings cut vocabulary by up to 50% with little loss. HWE and HCE stayed close to the baseline, while LCE and LWE compressed more with minor degradation.
- **Limitations:** restoration uses only RNNs, the task set is limited, and pretrained LLMs were not tested because of compute cost.

## Interesting ideas
- The null model is a random remapping that keeps the same group sizes, so the number of symbol collisions matches the meaningful grouping and only the "meaning" of the grouping changes. This is a clean way to ask whether a system exploits real structure or mere consistency. — For Mova (learn): permute tag or lemma-class labels while preserving class sizes, and use that as a negative control to confirm the parser or tagger gains come from linguistic signal rather than label stability.
- Instead of evaluating thousands of random variants, they score all 2,000 cheaply by entropy and run full experiments only on the extremes, which brackets the plausible range at low cost. — For Mova (learn): when ablating many random perturbations of training data or rules, rank them by a cheap statistic and fully evaluate only the best and worst cases.
- The pipeline deliberately works on a lossy, reduced representation and then recovers the full form with a learned restoration model. This trades exactness for smaller vocabularies and cheaper models. — For Mova (tokens): normalize noisy surface variants (case, spelling or punctuation variants) into a reduced alphabet for tagging and morphology, then restore the original form afterwards so every step stays traceable.
- Vocabulary size, V/N, entropy, and Zipf/Heaps curves are reported for every combination of mapping and tokenizer. This exposes interactions: under the disjoint-letters tokenizer, the LWE mapping actually enlarged the vocabulary instead of shrinking it. — For Mova (tokens): when changing the tokenizer or lemma scheme, publish the same corpus statistics grid so that unexpected vocabulary blow-ups are caught before training.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

Fields: [Linguistics & languages](https://md.research.elamur.ai/free/en/shelves/linguistics/)

## Cite

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@misc{ahmad2026character,
  title = {{Character Iconicity vs. Arbitrariness: An Arabic NLP Perspective}},
  author = {Ahmad;, Dorieh Alomari; Irfan and Al-shaibani, Maged S.},
  year = {2026},
  doi = {10.48550/arxiv.2608.02935},
  eprint = {2608.02935},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2608.02935}
}
```

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