In heraldry, tenné or tawny is a "stain", a rarely used tincture, an orangish brown colour. Some authors (particularly in England) consider it the same as orange, but that is not the case in continental heraldry.
In South Africa, tenné is interpreted as orange, and it was used in the arms of several government departments and military units adopted before 1994. At that time, the national flag was orange, white and blue.
Other than CD5700, there are other hex numbers that are used for this color, including CF5300 and CE5600. Tenne is also very similar to Burnt orange.