# Null-glyph deletion

> Run 2 times on the site, with every result.

Source: https://mysteriesdept.com/methods/MTH08JFX97Y19ZK/null-glyph-deletion  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[Methods](https://mysteriesdept.com/methods)[Cryptanalysis](https://mysteriesdept.com/methods?kind=cryptanalysis)Null-glyph deletion

Method · cryptanalysis

# Null-glyph deletion

**Cryptanalysis** Version **1.0** Licence **MIT2** runsUsed on **1** mystery

## Questions it answers

- [Is it a cipher of a known language?](https://mysteriesdept.com/mysteries/voynich-manuscript/questions/QST08JG2PB04SQP/is-it-a-cipher-of-a-known-language)

## Code Python

[Download module (.py)](https://mysteriesdept.com/files/584f859102c6630777a7c0e3055fc8e1c876dbef7911a4a0f1a7b923a1ead165.py)`t_periodicity.py`[View source](https://mysteriesdept.com/files/584f859102c6630777a7c0e3055fc8e1c876dbef7911a4a0f1a7b923a1ead165.py)

## Runs and results 2 runs

| Run | Mystery | Measured | Result | Against | Date |
|---|---|---|---|---|---|
| RUN-026 | Voynich | Max h2 after deleting one glyph unit | 2.749 | Attested minimum 2.51 (languages lose 0.1-0.4 bits when their commonest letter is deleted) | 22 Oct |
| RUN-012 | Voynich | Max h2 after deleting one glyph unit | 2.403 | Attested minimum 2.51 (languages lose 0.1-0.4 bits when their commonest letter is deleted) | 22 Oct |

## Applied to

![Voynich Manuscript](https://mysteriesdept.com/media/folio/78r)

**[Voynich Manuscript](https://mysteriesdept.com/mysteries/voynich-manuscript)2 datasets** GC2a transcription, ZL3b transcription

[Download module](https://mysteriesdept.com/files/584f859102c6630777a7c0e3055fc8e1c876dbef7911a4a0f1a7b923a1ead165.py)

Category

Cryptanalysis

Version

1.0 · 25 Oct 2026

Licence

MIT

Language

Python

Cite

[BibTeX](https://mysteriesdept.com/methods/MTH08JFX97Y19ZK/null-glyph-deletion/cite.bib) · [APA](https://mysteriesdept.com/methods/MTH08JFX97Y19ZK/null-glyph-deletion/cite.txt)

Develop this method

Methods are versioned like code. Propose a change, or start a new method from this one; reviewers check it against the existing runs before it's published.

 [Start a new method from this](https://mysteriesdept.com/developers)[Propose a change](https://mysteriesdept.com/developers)[Run on a dataset](https://mysteriesdept.com/developers)

Authors

**[apollo](https://mysteriesdept.com/u/apollo)** Wrote version 1.0