From time to time, there comes a need to notify other Rats of what's going on. We all know about a Ratsignal and what means, but are you aware of:
OPSIGNAL - Sometimes things just go wrong and someone needs to step in (or a hammer needs to be swung). If there is an emergency and you need to get a Janitor's attention for any reason, type this along with any relevant information (i.e. look at #ratchat , attack in #fuelratsfor <reason>, etc.). This signal is intended for critical issues where an immediate response from a janitor is needed, and does not include less critical issues such as cats, minor misbehavior or similar. The IRC's spamfilter will block the message from being sent, but notify the Janitor's Janitors of your message. This can be used in any channel or private message.
HATSIGNAL - Hatsignal is a term used to notify other Rats that a dispatch is needed. It should only be used after a client is !prep'd (which every drilled rat should and can do).
PC_SIGNAL - pc_signal is a term used by Dispatchers and Mechasqueak to notify other rats in the PC universe there is a rescue that needs a couple extra tails.
TECHSIGNAL - This is perhaps the most confusing of all signals. If you have a serious (something is on fire) problem that can't be resolved by submitting a helpdesk ticket (http://t.fuelr.at/help) and that isn't related to ongoing maintenance or other related system work (https://status.fuelrats.com/) then light this signal to notify the Techrats.
CATSIGNAL - Cats are the notoriously sneaky and misbehaving arch enemies of Rats everywhere. A catsignal used to be a term used to notify Janitors of an ambush or other rescue related attack on Rats. It's no longer necessary to use this and any case where this would be appropriate should be an OPSIGNAL. If there is a Cat, please ping the nearest available Janitor. This is not a critical event, and OPSIGNAL should NOT be used.