The term 'BASIC COMMAND' refers to a set of instructions used in the programming language BASIC. The three crossword solutions for this term are SIT, ATOM, and GOTO. SIT stands for 'Single Instruction Tool, ' which is a type of command line interpreter used in BASIC. ATOM stands for 'Automatic Terminal Output Monitor, ' which is a type of program that monitors the output of a terminal. Finally, GOTO stands for 'Go To, ' which is a command used to jump to a specific line of code in a program.