What is the plus sign found on some aircraft bodies?

The first time I saw this sign was on a Robinson R44 helicopter. The "plus sign" was located below the right front door.

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    $\begingroup$ got any pics? It's easier to know what you are talking about then. $\endgroup$ – ratchet freak Jan 21 '16 at 12:32
  • $\begingroup$ Are you referring to a marking, something painted onto the aircraft? You don't mean something like this photo do you? $\endgroup$ – J Walters Jan 21 '16 at 13:59
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    $\begingroup$ If it's what @JonathanWalters was referring to, but much smaller, it probably marks the location of a first aid kit. $\endgroup$ – FreeMan Jan 21 '16 at 14:04
  • $\begingroup$ I agree with @FreeMan, its most likely a first aid kit, although after looking through probably 100 R44 pictures on Google images, I didn't see a single one with this mark. $\endgroup$ – Ron Beyer Jan 21 '16 at 15:01
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    $\begingroup$ Yes, a picture or, at least, more detailed description is needed for this to be answerable. At the moment it could be anything from a first aid kit to indicating that the aircraft is a medical evacuation aircraft to indicating that the aircraft flies for Swissair. $\endgroup$ – reirab Jan 21 '16 at 16:28

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