The charity, along with counterparts in Australia and Canada, created the emoji to accompany a number of hashtags being used to promote this year’s Remembrance events.
Tweeting the hashtags #BehindThemAlways, #GetYourPoppy, #LestWeForget, #RemembranceSunday and #TwoMinuteSilence will automatically cause the poppy to appear, Poppyscotland said.
The emoji will be available from today until 15 November.
This year’s Remembrance Sunday and Armistice Day events mark 100 years since the first Remembrance Day, which took place in 1919, a year after the end of the First World War.
Gordon Michie, head of fundraising at Poppyscotland, said: "Engaging different audiences in different ways during the Poppy Appeal and Remembrance period is vitally important to Poppyscotland.
"We especially hope young people will make use of the poppy emoji because, in order to uphold the memories of those who have gone before, it is vital we pass on the torch of remembrance to the next generation."
Katy Minshall, head of public policy and philanthropy at Twitter UK, said: "From today, we are giving people on Twitter the opportunity to join the conversation around Remembrance Day and commemorate those who served their country.
"By simply including one of the supporting hashtags, a poppy emoji will automatically appear, allowing people to show their mark of remembrance in a single Tweet."