acronym

kirjainsana, akronyymi, lyhennesana, lyhenne An abbreviation formed by (usually initial) letters taken from a word or series of words, that is itself pronounced as a word, such as RAM, radar, or scuba; sometimes contrasted with initialism.
2014, A teacher, "http://www.theguardian.com/education/2014/sep/23/choosing-primary-school-guide-teachers-guide-for-parents Choosing a primary school: a teacher's guide for parents", The Guardian, 23 September 2014:

Some teachers festoon every spare inch of wall with vocabulary choices or maths techniques to use, which look great at first, but to some children might appear quite daunting. You'll probably see unfamiliar acronyms such as Walt (We Are Learning To). Be sure to ask what they stand for and how they are used in practice.