Don't know this syntax - what does L mean?

in this line:

OCR1A=(((angle*(SERVO_AILE_MAX-SERVO_AILE_MIN))/180L)+SERVO_AILE_MIN)*2L;

180L? 2L?

Thanks!

The L declares the constant is a long-integer. This forces the compiler to perform the arthimetic using long-integers (32 bit) rather than int-integers (16 bit). Usually this is done to avoid an overflow.

thanks!