The icon should look like a broadcast communicationtower as shown in Figure 25.
该图标看上去像一个广播通信塔，如图 25 所示。
2
That's why a message is so limited in length: it must not exceed the length of the message used for internal communication between tower and handset to set up a call.
这就是为什么短信长度如此受限：它不能超过用于基站和手机间内部通信的消息的长度。
3
But the Eiffel Tower was built before radio communication was necessary, and even before the radio was invented.