For a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional. Or Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship, when temperature is held constant. If volume increases, then pressure decreases and vice versa, when temperature is held constant.
Yeah, except when it's not. The two fingers held aloft in a V are fine provided your palm is facing out, but in some countries -- namely, Australia, New Zealand, and the United Kingdom -- it's an insult of the first order if you make the same gesture but with your palm facing inward.
In the Islamic faith, the hamsa hand symbolizes The Hand of Fatima, daughter of the Prophet Mohammed. Many Jews believe that the five fingers of the hamsa hand remind its wearer to use their five senses to praise God. Hamsa hands often contain an eye symbol, which is a powerful talisman against the evil eye.