up-to symbol

基本解释

The mouth of the river was beginning to silt up—a powerful symbol of over-exploitation.
墨累-达令的河口开始被泥沙淤塞，这是过度开发的有力信号。
An up-and-down arrow symbol next to your task property name, in this example Task Name, means that you can sort your tasks by this propertyâ ™s value.
任务属性名（这个示例中的 Task Name）旁边的上下箭头符号表示可以按该属性值对任务进行排序。
The seamless integration of terrain, overground and underground entities is the principal symbol of up-to-date 3DGIS, and the seamless integrated spatial modeling has been an urgent demand.
地上下无缝集成三维建模是新一代3DGIS的主要标志，地上下无缝集成建模已成为当务之急。

Basically they merged with Desi TV, a publicly traded company (that couldn't dig up even a little info on), swapped the ticker symbol to XRMB, and started trading on the Over-The-Counter Bulletin Board securities market.
ENGADGET: Watch out: Xero merges, now a publicly traded company