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There are Watch V Onlinesome words we'd rather not hear uttered aloud when on public transport.

But, there's one code phrase that's used on London's transport network in the case of an emergency. And, it also happens to be quintessentially British.

"Inspector Sands" is a code term used by public transport authorities to make staff members and emergency services aware of an emergency in the station without panicking members of the public.

Commuters at Oxford Circus Underground station heard the code word in operation Friday morning, when a fire broke out on a Bakerloo line train at the station.

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"Would Inspector Sands please go to the operations room immediately?" was broadcast on a continuous loop in the station on Friday morning. A few minutes later a different announcement was broadcast over the tannoy asking everyone to leave the station immediately due to a "reported emergency."

According to Londonist, the Inspector Sands code is deployed in instances where fires break out on public transport in the UK. But, one Telegraph article suggests the code also pertains to bomb-related incidents. Transport for London didn't immediately respond to Mashable'srequest for clarification.

The code is believed to originally come from theatres, where "Mr. Sands" is used as a code announcement when a fire breaks out. Inspector Sands' surname stems from the use of sand buckets, which are sometimes used to extinguish fires.

Some feel that the announcement is quintessentially British as it embodies the spirit of Brits' "Keep Calm and Carry On" mentality.

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Keeping calm aside, here's hoping you don't hear Inspector Sands' name mentioned on the Tube any time soon.