In regards to what exactly? A&M could mean different things it depends on what category you need a definition. It could be Arts & Media or Acid & Melt.
What Does A & M Mean?
Quoted from www.tamu.edu
Q: What does "A&M" stand for? A: Texas A&M, the state's first public institution of higher education, was opened on Oct. 4, 1876 as the Agricultural and Mechanical College of Texas, and at that time the "A" and "M" initials were used to abbreviate the name components. When the institution gained university status in 1963, the "A&M" representation (no periods, no spaces and with an ampersand) was incorporated into the official name in deference to the institution's history and rich traditions, but the individual letters no longer explicitly stand for anything.
Q: What does "A&M" stand for? A: Texas A&M, the state's first public institution of higher education, was opened on Oct. 4, 1876 as the Agricultural and Mechanical College of Texas, and at that time the "A" and "M" initials were used to abbreviate the name components. When the institution gained university status in 1963, the "A&M" representation (no periods, no spaces and with an ampersand) was incorporated into the official name in deference to the institution's history and rich traditions, but the individual letters no longer explicitly stand for anything.