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Figure 3.6 shows how control streams are expressed in block diagrams, using control-to-signal and signal-to-control conversion as examples. Control streams are represented using dots (as opposed to audio signals which appear as solid arrows).
The signal operator converts from a numeric control stream to an audio signal. The exact type of conversion isn't be specified at this level of detail; when we see specific examples in Pd the choice of conversion operator will determine this.
The snapshot operator converts from audio signals back to numeric control streams. In addition to the audio signal, a separate, control input is needed to specify the time sequence at which the audio signal is sampled.