The “Speak” icon in Google Map:

This is the “Speak” icon in Google Map, used for inputing user’s voice to the search bar to find a location, it literally looks like a microphone using really simple elements to be express the concept of “Speak”, like most of the modern “Speak” icons. When people see this icon and notice that it’s a microphone, they will understand this icon stands for “Speak” because microphone is the metaphor of talking.

Egyptian hieroglyphic for “Speak”：

https://en.wikipedia.org/wiki/List_of_Egyptian_hieroglyphs

This Egyptian hieroglyphic symbol actually has more than one meanings. It can also represent “eat”, “drink”, “think”, “be silent”, “love”, etc. These meanings are conjectured based on the character’s pose, which is is one knee on the ground and one arm up closing to his mouth. I believe that this symbol tries to express something connect with mouth and head since he is raising arm and being close to his mouth, so all behaviors related with mouth and head can be the possible right answer.

When we look at these two “Speak” icons in different culture backgrounds, they actually don’t really have an obvious similarity. The Google Map “Speak” uses a universal tool that is the symbol of speaking and ancient Egyptians were more direct using a behavior to show the meaning of “Speak”.