The school is typically referred to as "Cal Poly", or simply "Poly". The university's style guide indicates its official names are "California Polytechnic State University" and "Cal Poly."[17] When necessary to distinguish between Cal Poly and its former satellite campus, Cal Poly Pomona, the lengthier "Cal Poly at San Luis Obispo" is occasionally used. The California State University system's style guide identifies the university as "California Polytechnic State University, San Luis Obispo" and the elided "Cal Poly San Luis Obispo."[18] Although Cal Poly San Luis Obispo is part of the California State University, its naming convention does not follow that of most campuses within the system (for example, the CSU campus in San Diego bears the full official name "San Diego State University" and the CSU campus in Fullerton uses the name "California State University, Fullerton").[19][20] Thus, "San Luis Obispo State University" or "California State University, San Luis Obispo" are seldom used.