Related Clues:

• 'Sesame Street' sponsor?
• Red ____ day
• Alphabet soup bit
• An alphabetic unit
• Written message
• A or e, say
• Unit of alphabet
• I or O
• aeio or u
• A written message
• Character of the alphabet
• Not a consonant
• A written form of communication
• This sounds as if it might allow 'er to be a male
• This might allow `er to be male, by the sound of it