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In the context of plural forms of letters, the letter 's' is pronounced as a voiceless sound. This is consistent across English language conventions when referring to multiple letters. For example, when pluralizing the letter 's' itself, it's pronounced like /s/, which is a voiceless sound, contrasted with voiced sounds where the vocal cords vibrate during pronunciation.

This voiceless quality is significant for clear communication in both written and spoken forms, especially when differentiating between singular and plural. As such, plural forms like "A's" and "B's" maintain this pronunciation standard, ensuring clarity in the pronunciation of letters when they appear in plural form.