Complex sentence: The binary representation of 1024 bytes typically uses the symbol KB, using an upper-case K. Informally sometimes the "B" is dropped, making K generally understood as 1024 bytes; however, this usage is not standardized and may be found used arbitrarily.
Split into simpler sentences: The binary representation of 1024 bytes typically uses the symbol KB, using an upper-case K. Informally sometimes the "B" is dropped, then K, has generally been understood as 1024 bytes. However, this usage is not standardized and may be found used arbitrarily.