Fatto generale: 110 is the number of stories (by common reckoning) of the Sears Tower in Chicago.
Fatto matematico: 110 is the side of the smallest square that can be tiled with distinct integer-sided squares.
Trivia: 110 is the TCP port used for POP3 email protocol.
Data storica: April 19th is the day in 1919 that Leslie Irvin of the United States makes the first successful voluntary free-fall parachute jump using a new kind of self-contained parachute.