• Letter alef
• Letter antedating
• Letter carrier
• Letter countersigning
• Letter exchange
• Letter grade
• Letter illegibility
• Letter initialling
• Letter jumbling
• Letter kerning
• Letter of acceptance
• Letter of acquittance
• Letter of apology
• Letter of approval
• Letter of commendation
• Letter of intent
• Letter of recommendation
• Letter of reference
• Letter of resignation
• Letter of the law