> ## Documentation Index > Fetch the complete documentation index at: https://docs.rime.ai/llms.txt > Use this file to discover all available pages before exploring further. # Spell function > Force letter-by-letter pronunciation of codes, IDs, and acronyms using the spell() function. The `spell()` function works on Coda, Arcana, and the Mist family. ## When to use `spell()` Sometimes you want a letter or number sequence to be spelled out, one unit at a time. At Rime, we make this easy with our `spell()` function. Using `spell()` natively introduces naturalistic pauses within the sequence. In particular, it groups numbers and letters into groups of three where possible, and two where necessary. For instance, a standard 10-digit telephone number is broken up as follows: > 4 2 5 `` 2 5 2 `` 8 9 `` 2 9 The same holds for spelling sequences, like long words, being broken up as follows: > P E N `` E L O `` P E We also introduce helpful pauses when transitioning between numbers and letters in mixed alphanumeric sequences, as follows: > P R M `` 4 2 3 `` G D D `` M L `` 2 3 `` 5 4 This holds for any number, letter, or alphanumeric string. They will be spelled out in full if included in the parentheses of `spell()`. Spell also works with common symbols like @ (at) or - (dash). Let’s see how this works: ## `spell()` applied to words If I want the sentence to read: > “The name is spelled J O N, A T H, A N.” **Input:** `the name is spelled spell(jonathan).`