How many of these world religions do you recognise from these symbols?
Creating a universal set of symbols that can be read across the world has long been the aim of socially responsible designers. Otto and Marie Neurath famously developed their Isotype system with the aim of making information as widely available as possible, to as wide a range of people as possible.
It might appear straightforward to design signs and symbols that people recognise across the world but things don't always work out as easily as that. Very few symbols have world wide recognition. Religious symbols such as a crucifix might be recognised globally but what about a symbol that represents turning a TV or laptop on. In developed countries the upside down semi circle with a bar sticking vertically out of it, is seen as the indicator of the power button but what about countries with a poorer population?
We don't accept symbols like the power icon instinctively, we have to learn these symbols. In the same way as written languages, visual languages must also be memorised. to quote the well known author on semiotics, David Crow, "All that is necessary for any language to exist is an agreement amongst a group of people that one thing will stand for another".
So when it comes to designing instructions for kits is it always necessary to try and use symbols that are already recognised, or is it OK to invent a whole new set of icons? If by using existing symbols you restrict the amount of information that you can convey, then maybe it might be worth trying to invent new ones.