St. Bartholomew, with large knife.
St. Matthew, with purse or bag.
St. Simon, with saw.
St. Thaddeus or Jude, with halberd.
St. Matthias, with lance.
XXI. A Circle signifies the World or Eternity, or perfection.
An Equilateral Triangle (or other equal three-fold form) stands for the Holy Trinity.
A Square or Quatrefoil for the World, ruled by the Cross.
XXII. The Monograms IH̅C̅ or IH̅S̅, and XP̅C̅ or XP̅S̅, are the first two and last letters of the Name Jesus and the title Christ in Greek (the C being the older form of S). They have been used from very early times, and are among the most beautiful and suggestive of the symbols. They should not be used indiscriminately, but given a due place of honour, such as on an altar-frontal or the orphrey of a chasuble or cope. They can be, and often are, extremely decorative, and the thoughtless worker is sometimes betrayed into placing them most inappropriately simply because she happens to possess a good drawing of one.