Kernel variables - where is TFM?

[Nickolay A. Kritsky]

Hello freebsd-hackers,

  While browsing FreeBSD kernel sources I ocassionally stick in some
strange words which I suppose are kernel-space global variables. For
example: ticks, hz. Where can I find info about such variables? Please
cc me in your reply, or reply me off-list because I am not subscribed
to -hackers.

Any help is very good.
-- 
Best regards,
;  Nickolay A. Kritsky
; SysAdmin STAR SPb
; mailto:nkritsky at star.spb.ru