The grade "kindergarten" would only be capitalized when used as a title, header, or category. It is not a proper noun.
a synonym for kindergarten is grade k
That spelling appears in many dictionaries, but also widely used is the hyphenated form "pre-kindergarten", abbreviated "Pre-K" or PK.
k-4 means kindergarten thru 4th grade in school k-4 means kindergarten thru 4th grade in school k-4 means kindergarten thru 4th grade in school
The ASCII value of capital K is 75. For a small k it is 107.
I always thought it was "K."
The correct spelling is "kindergarten" (a pre-school grade).