When you type /version you will often see something like this:

Ever wondered what those funny chars mean after the version number? Well
here they are:

TS	TimeStamp Version
 TS3	TimeStamp Version 3
 TS7	TimeStamp Version 5 or later

6	Ipv6 Support
Z	Ziplinks Support
E	OpenSSL Support
G	Greeklish Support

SM	Static Modules
DM	Dynamic Modules

NB	No Block Heap Allocator
B	Block Heap Allocator

SN	Small Network support
NN	Normal Network support

select	Uses select() 
poll	Uses poll()
kqueue	Uses kqueue/kevent()
sigio	Uses RTSIGIO
devpoll Uses /dev/poll