Vanity plates are available for many of the types issued: passenger car, combination, commercial, etc.
Connecticut started the vanity plate concept with 'Initial' plates in 1937 - motorists with good driving records were allowed to have plates with their initials (2 or 3 letters). Later on in the late 1940's, 4 letters were available. Since the number of letter combinations was very limited, people had to get creative if their initials had already been issued to someone else. Common ideas were repeating the intials, e.g. JWJW, and using the letter 'X', e.g. XJWX.
In the late 1960s vanity plates could be issued with up to three letters followed by 1 or 2 numbers. A maximum of 5 characters was permitted.
In the early/mid 1970s 6-character plates were allowed. Around this time, the governor first allowed single-letter vanity plates for his closest supporters.
Seven-character plates are now available.