TCC is an acronym that can refer to several different things depending on the context. Most commonly, TCC stands for Tiny C Compiler, a small, fast C language compiler designed by Fabrice Bellard. It supports ANSI C and many GNU C extensions, produces native code for x86, x86-64, and ARM processors, and is notable for its very fast compile times and ability to run programs directly at compile time without intermediate files. TCC is often used in environments with limited resources or for quick code testing. Beyond computing, TCC can also mean Transitional Cell Carcinoma, a type of cancer affecting the transitional cells in the urinary system—primarily the bladder, renal pelvis, and ureter. This form of cancer can vary in severity and spread. TCC may also refer to various organizations, companies, and educational institutions such as Tacoma Community College or Taiwan Cement Corporation among others. In summary, the meaning of TCC varies widely:

• In computing: Tiny C Compiler, a lightweight, fast C compiler.
• In medicine: Transitional Cell Carcinoma, a urinary system cancer.
• In business and education: names of companies and colleges.

If you specify the context, a more focused explanation can be provided.