also spelled cross tatoos and cross tattos
There are all sorts of cross designs. Just some shown on the third image are: greek cross, latin cross, ankh, german cross, maltese cross. The cross is used as a religious symbol and as an astrological and mathematical sign. It's also used in alchemy, targets, computer cursors, lots of flags, as a medical sign for first aid.
The cross can mean burden, salvation, pain, power and addition.
Crosses often appear along with rose and thorn tattoos, a heart with the word "Mom" tatoos and angel tattoos.