From 3.2 blog post:
3.2.e Administrative distance
Administrative distance is the way Cisco routers chose between routes with the same prefix. Cisco favours some types of routes and routing protocols over others.
Refer to line 3 of the routing table above:
O 10.234.132.0/24 [110/2] via 10.200.20.46, 00:34:57, GigabitEthernet5/0
The square brackets hold the Administrative Distance and Metric (110 and 2 respectively). The O at the beginning at the line corresponds to OSPF, if you look below you will see OSPF has an Administrative Distance of 110.
Here is list of Administrative Distances:
0 => Connected 1 => Static 20 => BGP (external routes) 90 => EIGRP (internal routes) 100 => IGRP 110 => OSPF 115 => IS-IS 120 => RIP 170 => EIGRP (external routes) 200 => BGP (internal routes) 254 => DHCP default route 255 => Unusable