Those 2 dots are known as an umlaut in English.
Their use depends on the language. In Spanish, we use umlauts to know if we need to pronounce the “u” or not.
The pronunciation of the word “guerra” is a standard way to use the “u” after a “g” or a “q.” In this kind of use, the “u” is silent, but it lets you know that you need to pronounce the “g” as a hard “...(more)
Do you know some engineering terms in English? by Markus Wagner; Answer on from credit and thanks for this; level indicator intensity range vertical-amplifier dynamic range control flux density emitter nozzle replacement filter alternate device replacement module programmable logic controller wit...(more)