Firetrucks have the world fire written two ways, as seen here, on the front of the truck. why is that ?

While the image this question refers to is missing, I am assuming it shows the word FIRE (1) written in a normally readable way, (2) written in a mirrored way. The display (2) is used in order for other vehicle drivers being able to read the word FIRE in their mirrors (rearview and side).  The word printed in a mirrored way will appear normal via a mirror (i.e., the mirror "undoes" the mirroring originally introduced).

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation

at right angles to each other