Regulations last checked for updates: Nov 22, 2024

Title 49 - Transportation last revised: Nov 18, 2024
Appendix Appendix B - Appendix B to Part 220—Recommended Pronunciation of Numerals

To distinguish numbers from similar sounding words, the word “figures”should be used preceding such numbers. Numbers should be pronounced as follows:

Number Spoken
0ZERO.
1WUN.
2TOO.
3THUH-REE-.
4FO-WER.
5FI-YIV.
6SIX.
7SEVEN.
8ATE.
9NINER.

(The figure ZERO should be written as “0” to distinguish it from the letter “O”. The figure ONE should be underlined to distinguish it from the letter “I”. When railroad rules require that numbers be spelled, these principles do not apply.)

The following examples illustrate the recommended pronunciation of numerals:

Number Spoken
44FO-WER FO-WER.
500FI-YIV HUNDRED.
1000WUN THOUSAND.
1600WUN SIX HUNDRED.
14899WUN FO-WER ATE
NINER NINER.
20.3TOO ZERO DECIMAL
THUH-REE.
source: 63 FR 47195, Sept. 4, 1998, unless otherwise noted.