A practical bindrune may combine two or more runes to form a single design representing the runic powers of the included runes. The purpose of the bindrune is to enable a controlled release of those runic energies for the benefit of the user, or someone he or she wants to help or influence.
Bindrunes can only be used to help people, not to harm them. Any attempt to place a curse, prevent a person doing something, or to make something nasty happen to them will inevitably backfire on the user. However there are some Galdrastafurs that exist with the sole purpose of causing damage to others or things but unless you are a skilled practitioner of Norse magick I highly suggest you do not attempt to use them.
Although a bindrune is a blending of runic characters, each rune included in the design has to retain its own individuality, it has to be visible as an entity within the whole. I find it is best to limit the design to no more than four, or maybe five characters at the most, so that it can still be symmetrical, balanced and pleasing to the eye.
There are exceptions to this rule, however. Some very ancient and highly effective bindrunes incorporate 6, 7 or even 8 different runes. But generally speaking, the simpler the design, then the more effective the bindrune will be.
Bindrunes are devised for specific purposes. They can generate mental activity such as memory, logic, emotion, enlightenment, strength of will, courage, fairness, clarity of thought. They can aid physical actions too, such as health, strength, speed, endurance, and all the 5 senses.
Bindrunes can produce a runic field of energy to protect your person, your home or possessions, your job or your business good-will, and they can enhance relationships by encouraging harmony, partnership, love or sexual attraction.
You could easily draw a bindrune on a piece of paper, wood, stone or anything and carry it with you hoping that it will have some effect. But the un-empowered bindrune will be so weak that you would probably not notice any difference. For a bindrune to work effectively it must be empowered in the correct way which for me really involves your intentions because intentions and even your mood and emotions have energy which can unintentionally be woven into the bindrune and that potentially will cause it to have the wrong effect.