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Are there IPA representations for geminate consonants?

In my conlang, I have separate characters differentiating between a short and long consonant. There is a symbol which denotes an elongated vowel using the suprasegmental [ː]; however, I have not seen a specific symbol used with consonants (perhaps mː ?). Arabic has the shadda which denotes a double consonant which alone can make the difference between two words and is usually pronounced accordingly. Unfortunately, not all languages pronounce a double consonant differently over a single consonant (cf. English lighter vs. better or German Kater vs. Mutter.)

I apologize if this has been discussed previously, but my searches have not produced adequate results.

The colon (or slightly modified colon) is used for geminate consonants as well as long vowels. You could also write the consonant twice if that makes sense.

Yes, <ː> is the symbol you want, for consonants as well as vowels. Note that /mː/ and /mm/ are not necessarily the same thing and can contrast: you could have a hypothetical /amː.a/ vs. /am.ma/, for example. (I've always been fascinated by languages like Berber that feature word-initial long consonants...)

Brilliant! Thank you both for the guidance. I just needed a way to accurately represent the pronunciation as best as I can. I will incorporate this into my lexicon.