Provided that the metre is the same, the lines are referred to as a 'couplet'.
A point that a group of lines go through
That is referred to as the "mode".
If the sides are straight lines, then it is normally referred to as a 400-gon.
A group of three digits is commonly referred to as a "trio" or "triplet." In specific contexts, such as in mathematics or coding, it may also be called a "three-digit number." Additionally, in the context of music, a group of three notes played together can be referred to as a "triplet."
Lines that remain equidistance from one another without intersecting
The lines of longitude.
limerick
A group of motorcars can be referred to as a convoy or a fleet.
A group of bubbles is referred to as foam or froth.
A group of chickens is referred to as a "flock".
A group of nuns is generally referred to as a convent.
A group of seaman is simply referred to as a crew. They are members of the Navy, and can also be referred to in that way, as crew members on the ship.
The youth age group that is generally referred to by the word tweens, also commonly referred to as tweeners, are those whom are 10 to 13 years of age.
Prostaglandins are the group of hormones referred to as tissue hormones.
Thiol.
It is referred to as a 'fever'.