I just spent ten days on a tour of Turkey. It was brilliant. One of the new words I learned while there was 'selfie stick', the extensible rod that allows one to take a selfie with a wider frame than can be achieved just with one's arm. They seem to be everywhere among tourists, especially those from China and Japan.
Here a selfie of our group on a hill overlooking Istanbul, taken using a selfie stick. (Should it be called a 'groupie' rather than a 'selfie'?)
One question arises: is 'selfie stick' the right name for it? Some people prefer to call it a 'monopod', though Wikipedia notes that monopod has a broader meaning, referring to the device that is used to hold a camera steady, so it is used for old-fashioned photography that needs long exposure time and it predates the selfie.
It is common for newly-invented devices and new technology to have uncertain terminology for a while. Initially, a 'mobile phone' was also called a 'cell phone' by many, though 'mobile' seems to be winning out. But it seems that 'selfie stick' is becoming established for this new device, though maybe some people still prefer a longer name 'monopod selfie stick'.
One other question is: how old is it? This page from the Guardian suggests that the earliest use of the device (though not the term) is 1926.