Generic term for letters in numerical abbreviations and related online references

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😎 In 3M, 3b, 3T, etc. the letter stands for “millions”, “billions”, “trillions”, etc. What do you call the letter? A generic term for that letter.
🤖 I call that letter a suffix.
😎 Search for a any web page (online forum, whatever) where someone uses the term “suffix” to refer specifically to that letter in the abbreviated notation of numbers. Give quotes sentence and URL
🤖 I have located a relevant usage on the MrExcel forum. The thread includes this sentence:

> “I would consider the letter ‘M’ in 5M as a suffix meaning million.”

URL: [https://www.mrexcel.com/board/threads/force-the-letter-m-after-a-number.338335/](https://www.mrexcel.com/board/threads/force-the-letter-m-after-a-number.338335/)

Hugging Face Dataset Metrics

All the conversation prompts, responses, and metrics are available to download and explore on Hugging Face dataset reddgr/talking-to-chatbots-chats: