I've seen this symbol before. Actually it's an "I", your looking at it sideways, It stands for Industry Brand of Shanghai China. I own two of these rifles.
These are fairly inexpensive air rifles and a little rough. The Safety design is usually a little weak. But with work they shoot OKAY.
Pentagon shaped. i would have said trianjgular but its pentagon
Stop sign?
Children Crossing/ a school warning sign
The pentagon road sign indicates that you are approaching a school zone or a school crossing. It serves as a warning to drivers to slow down and be cautious of children crossing the road.
A pentagon is a 5-sided polygon. A regular pentagon has all sides of equal length and all interior angles are equal, each measures 108°.
Air you asking about airguns as in Pneumatic tools, or as in shooting.
If the pentagon is a regular pentagon, then each of the central angles (formed by joinning the center with the vertices) is72⁰ (1/5 of 360⁰). So that 5 congruent isosceles triangle are formed, with base angles of 54⁰. If we draw the height, of these triangles (from the center to the sides of the pentagon), 10 congruent right triangles are formed. Let denote with: b the sides of the pentagon, and h the height. In one of the right triangles we have: tan 54⁰ = h/(b/2) tan 54⁰ = 2h/b 1.38 = 2h/b 2h = 1.38b h = (1.38/2)b h = .69b So that, h/b = .69b/b = .69
A pentagon is a plane figure and has only two dimensions. It cannot have three dimensions.
There are websites specifically for the sale of guns, but airguns can also be found on websites like Amazon and eBay for sale. Gunmart is a popular website to buy airguns from.
A hexagon is a 6-sided figure, while a pentagon is a 5-sided figure. A school crossing sign in the United States is a pentagon. In many cases, hexagons and pentagons have sides that are all the same length, although this is not required.
The chemical symbol for hydrogen is H.
Pedestrian crossing or school zone