Standard size custom plate, no special meaning. The interesting thing about these plates is they have been issued with the letter O not the number 0. Having a cleanout, needs to go. I have the following plates for sale on here as well:
HDBOY
6-NINE
ERIKG
BRIT-03
MIA-26
O4O4O4
O4O4O
O6O6O
OMG-1
1-OMG