Yep, and numbers, in particular, need to be enunciated clearly and precisely, to prevent what could be costly, and dangerous confusion.
For example, the number four is pronounced "Fower", five is pronounced "Fife", and nine as "Niner", whilst the figure O is always pronounced as "Zero", never "Oh" or "Nought".
A 'point', as in a number combination, such as 125.9, is pronounced as "Decimal", for example, "Change to frequency One Two Fife Decimal Niner" .
Some phrases, particularly in military use, are not used unless that phrase is for a specific instruction. The phrase "Say again" has become common in everyday, civilian use, and comes from the R/T request to to repeat what has been said previously, for example "Say again all after ...", and is used to specifically avoid the use of the word 'Repeat'.
This is because the word 'Repeat' is an order to repeat the same Fire Order, for artlillery, mortars and other 'heavy' weapons, and should only be used in that context. Use in other ways could result in friendly forces being hit by their own fire support, commonly called 'Friendly fire', which is far from friendly when it lands !!
Even with modern technology, radio communication is still affected by atmospheric conditions, location and terrain, and therefore radio traffic has to be organised in a precise and understandable manner, hence the use of such words and phrases as mentioned in these posts.
Out.