Tern sea terns have light grey or white body plumage as adults, with a black cap to the head. The legs and bill are various combinations of red, orange, yellow, or black depending on species. The pale plumage is conspicuous from a distance at sea, and may attract other birds to a good feeding area for these fish-eating species. When seen against the sky, the white underparts also help to hide the hunting bird from its intended prey. The Inca tern has mainly dark plumage, and three species that mainly eat insects, the black tern, white-winged tern, and black-bellied tern, have
Numerology summing digits in these bases yields different results. The first example, shown above, appears thus when rendered in octal (base 8): The Arabic system of numerology is known as Abjad notation or Abjad numerals. In this system each letter of Arabic alphabet has a numerical value. This system is the foundation of "ilm-ul-cipher", the Science of Cipher, and "ilm-ul-huroof", the Science of Alphabet: ط=9 ح=8 ز=7 و=6 ه=5 د=4 ج=3 ب=2 أ=1 ص=90 ف=80 ع=70 س=60 ن=50 م=40 ل=30 ك=20 ي=10 ظ=900 ض=800 ذ=700 خ=600 ث=500 ت=400 ش=300 ر=200 ق=100 غ=1000 Some Chinese assign a different set of meanings to